Southwest Washington Regional Transportation Council

NE 78th St. / Hwy. 99

Use the tabs below to select various information provided for this intersection. The first tab offers a map of the intersection location, and a means of locating nearby count locations. Data for each intersection is offered by “leg” which is, at times, not entirely intuitive. Waving your mouse over the names above should clear up any ambiguities. Directional Average Weekday (24 hour average), AM Peak Hour (7-8 a.m.), PM Peak Hour (peak hour between 4-6 p.m.), and PM Peak Turn Movement (right, left, and through), are included in the summary. The final tab provides scanned PDF documents (where available) of the original count data for this intersection.

Aerial Map

 

North Leg Traffic Counts (Hwy. 99)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
20170000000
201694851067720162826909457517
2012104861002420510965902295321
20089382992419306925920264375
200610001947219473910814331356
20021189610551224471038863341369
2001112471130522552998905293468
19999822983819661982791268441
19979769999619766897811259408
1996127751196124735123004010
19931388613078269641281885378791
199100206010000
19901215211531236830000
19881241613084255000000
19850000000
1983110261123022256109284600

South Leg Traffic Counts (Hwy. 99)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
20170000000
2016106561171022366986914529738
2012106871173922426993962291524
20081057411399219741074993310548
200610655919919854990741320493
2002115930080602570
200113211156382884912851228347834
19991281410437232511204840337433
19971257811515240921116885312475
19961299111688246801252915363555
19931474711981267281281842295571
1991120728759208311250669276434
1990104181039620814103197700
19881157010770223400000
1985097000081000
1983177091002427733211680600

East Leg Traffic Counts (NE 78th St.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
20171253511965245001071877676628
201613471125532602412341067825827
20121212013015251359581202578583
200811765115612332511271011566616
200612963122262518912151029708628
200210230922019450818787463374
20011241210574229861124863539413
1999119961088122877836856667505
199710047958219628870800467450
19969615648016095773771708515
19931195576951965110166070366
199197828785185679046800544
1990976489911875696054000
1988897911054200330000
1985824587801702578068000
19839991102442023586974700

West Leg Traffic Counts (NE 78th St.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
201715152165053165710861377840717
20162020917613378231680154613141027
201218642184093705115981537908754
200817138166543379115021510866763
200616601164663306714501400955702
200214821143312915212011179692526
200115353134382879212081142767470
199915696149023059810941228877586
199714167134992766612201172652537
199615911156403155014411296692855
19930000000
199100245840000
19901302514631276561323122400
19881122313038242610000
19850000000
198315352701122363111291400